include/linux/hid-sensor-hub.h

   1 /*
   2  * HID Sensors Driver
   3  * Copyright (c) 2012, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  */
  19 #ifndef _HID_SENSORS_HUB_H
  20 #define _HID_SENSORS_HUB_H
  21
  22 #include <linux/hid.h>
  23 #include <linux/hid-sensor-ids.h>
  24 #include <linux/iio/iio.h>
  25 #include <linux/iio/trigger.h>
  26
  27 /**
  28  * struct hid_sensor_hub_attribute_info - Attribute info
  29  * @usage_id:           Parent usage id of a physical device.
  30  * @attrib_id:          Attribute id for this attribute.
  31  * @report_id:          Report id in which this information resides.
  32  * @index:              Field index in the report.
  33  * @units:              Measurment unit for this attribute.
  34  * @unit_expo:          Exponent used in the data.
  35  * @size:               Size in bytes for data size.
  36  */
  37 struct hid_sensor_hub_attribute_info {
  38         u32 usage_id;
  39         u32 attrib_id;
  40         s32 report_id;
  41         s32 index;
  42         s32 units;
  43         s32 unit_expo;
  44         s32 size;
  45 };
  46
  47 /**
  48  * struct hid_sensor_hub_device - Stores the hub instance data
  49  * @hdev:               Stores the hid instance.
  50  * @vendor_id:          Vendor id of hub device.
  51  * @product_id:         Product id of hub device.
  52  * @ref_cnt:            Number of MFD clients have opened this device
  53  */
  54 struct hid_sensor_hub_device {
  55         struct hid_device *hdev;
  56         u32 vendor_id;
  57         u32 product_id;
  58         int ref_cnt;
  59 };
  60
  61 /**
  62  * struct hid_sensor_hub_callbacks - Client callback functions
  63  * @pdev:               Platform device instance of the client driver.
  64  * @suspend:            Suspend callback.
  65  * @resume:             Resume callback.
  66  * @capture_sample:     Callback to get a sample.
  67  * @send_event:         Send notification to indicate all samples are
  68  *                      captured, process and send event
  69  */
  70 struct hid_sensor_hub_callbacks {
  71         struct platform_device *pdev;
  72         int (*suspend)(struct hid_sensor_hub_device *hsdev, void *priv);
  73         int (*resume)(struct hid_sensor_hub_device *hsdev, void *priv);
  74         int (*capture_sample)(struct hid_sensor_hub_device *hsdev,
  75                         u32 usage_id, size_t raw_len, char *raw_data,
  76                         void *priv);
  77         int (*send_event)(struct hid_sensor_hub_device *hsdev, u32 usage_id,
  78                          void *priv);
  79 };
  80
  81 /**
  82 * sensor_hub_device_open() - Open hub device
  83 * @hsdev:       Hub device instance.
  84 *
  85 * Used to open hid device for sensor hub.
  86 */
  87 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev);
  88
  89 /**
  90 * sensor_hub_device_clode() - Close hub device
  91 * @hsdev:       Hub device instance.
  92 *
  93 * Used to clode hid device for sensor hub.
  94 */
  95 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev);
  96
  97 /* Registration functions */
  98
  99 /**
 100 * sensor_hub_register_callback() - Register client callbacks
 101 * @hsdev:       Hub device instance.
 102 * @usage_id:    Usage id of the client (E.g. 0x200076 for Gyro).
 103 * @usage_callback: Callback function storage
 104 *
 105 * Used to register callbacks by client processing drivers. Sensor
 106 * hub core driver will call these callbacks to offload processing
 107 * of data streams and notifications.
 108 */
 109 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
 110                         u32 usage_id,
 111                         struct hid_sensor_hub_callbacks *usage_callback);
 112
 113 /**
 114 * sensor_hub_remove_callback() - Remove client callbacks
 115 * @hsdev:       Hub device instance.
 116 * @usage_id:    Usage id of the client (E.g. 0x200076 for Gyro).
 117 *
 118 * If there is a callback registred, this call will remove that
 119 * callbacks, so that it will stop data and event notifications.
 120 */
 121 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
 122                         u32 usage_id);
 123
 124
 125 /* Hid sensor hub core interfaces */
 126
 127 /**
 128 * sensor_hub_input_get_attribute_info() - Get an attribute information
 129 * @hsdev:       Hub device instance.
 130 * @type:        Type of this attribute, input/output/feature
 131 * @usage_id:    Attribute usage id of parent physical device as per spec
 132 * @attr_usage_id:       Attribute usage id as per spec
 133 * @info:        return information about attribute after parsing report
 134 *
 135 * Parses report and returns the attribute information such as report id,
 136 * field index, units and exponet etc.
 137 */
 138 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 139                         u8 type,
 140                         u32 usage_id, u32 attr_usage_id,
 141                         struct hid_sensor_hub_attribute_info *info);
 142
 143 /**
 144 * sensor_hub_input_attr_get_raw_value() - Synchronous read request
 145 * @usage_id:    Attribute usage id of parent physical device as per spec
 146 * @attr_usage_id:       Attribute usage id as per spec
 147 * @report_id:   Report id to look for
 148 *
 149 * Issues a synchronous read request for an input attribute. Returns
 150 * data upto 32 bits. Since client can get events, so this call should
 151 * not be used for data paths, this will impact performance.
 152 */
 153
 154 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
 155                         u32 usage_id,
 156                         u32 attr_usage_id, u32 report_id);
 157 /**
 158 * sensor_hub_set_feature() - Feature set request
 159 * @report_id:   Report id to look for
 160 * @field_index: Field index inside a report
 161 * @value:       Value to set
 162 *
 163 * Used to set a field in feature report. For example this can set polling
 164 * interval, sensitivity, activate/deactivate state.
 165 */
 166 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 167                         u32 field_index, s32 value);
 168
 169 /**
 170 * sensor_hub_get_feature() - Feature get request
 171 * @report_id:   Report id to look for
 172 * @field_index: Field index inside a report
 173 * @value:       Place holder for return value
 174 *
 175 * Used to get a field in feature report. For example this can get polling
 176 * interval, sensitivity, activate/deactivate state.
 177 */
 178 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 179                         u32 field_index, s32 *value);
 180
 181 /* hid-sensor-attributes */
 182
 183 /* Common hid sensor iio structure */
 184 struct hid_sensor_common {
 185         struct hid_sensor_hub_device *hsdev;
 186         struct platform_device *pdev;
 187         unsigned usage_id;
 188         bool data_ready;
 189         struct iio_trigger *trigger;
 190         struct hid_sensor_hub_attribute_info poll;
 191         struct hid_sensor_hub_attribute_info report_state;
 192         struct hid_sensor_hub_attribute_info power_state;
 193         struct hid_sensor_hub_attribute_info sensitivity;
 194 };
 195
 196 /* Convert from hid unit expo to regular exponent */
 197 static inline int hid_sensor_convert_exponent(int unit_expo)
 198 {
 199         if (unit_expo < 0x08)
 200                 return unit_expo;
 201         else if (unit_expo <= 0x0f)
 202                 return -(0x0f-unit_expo+1);
 203         else
 204                 return 0;
 205 }
 206
 207 int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
 208                                         u32 usage_id,
 209                                         struct hid_sensor_common *st);
 210 int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
 211                                         int val1, int val2);
 212 int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
 213                                         int *val1, int *val2);
 214 int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
 215                                         int val1, int val2);
 216 int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
 217                                         int *val1, int *val2);
 218
 219 #endif